OpenAI to give EU access to new cyber model but Anthropic still holding out on Mythos

OpenAI announced on Thursday it was granting preview access to its latest cyber model to vetted cybersecurity teams.
SiliconANGLE

OpenAI launches GPT-5.4-Cyber model for vetted security pros

OpenAI Group PBC today announced the launch of GPT-5.4-Cyber, a fine-tuned variant of its GPT-5.4 model designed for defensive cybersecurity work and also announced a significant expansion of its ...
9to5Mac

OpenAI unveils GPT‑5.4‑Cyber, an AI model for defensive cybersecurity

OpenAI has announced a new AI model called GPT-5.4-Cyber. Similar to Anthropic’s Claude Mythos, this new “cyber-permissive” variant of its GPT-5.4 is built for defensive cybersecurity and not public ...
The Next Web

OpenAI opens its cybersecurity model to thousands of defenders in race with Anthropic’s Mythos

In short: OpenAI is releasing GPT-5.4-Cyber, a model fine-tuned for defensive cybersecurity with lowered refusal boundaries and binary reverse engineering capabilities, and scaling its Trusted Access ...
Dark Reading

'Richter Scale' Model Measures Magnitude of OT Cyber Incidents

S4x26, MIAMI — Feb. 24, 2026 — A newly developed method for gauging the impact of an OT cybersecurity incident could pave the way for more accurate measurement and response to an event, and also shine ...

OpenAI’s new security model is for ‘critical cyber defenders’ only

OpenAI is preparing to launch a new frontier cybersecurity model, GPT-5.5-Cyber. CEO Sam Altman said the model will not be ...